Scientists and biologists study the world using experimentation. This can be done through observation, or by performing scientific tests in a lab.
Answer:
Revenge comes at a great cost.
Explanation:
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Answer: B
Explanation: The circulatory system is responsible for bringing food and oxygen to every cell in your body. The respiratory system is responsible for carrying oxygen and carbon dioxide in and out of your body. The excretory system is responsible for removing waste from your body.
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Explanation:
Pulmonary Arteries where the blood is re-oxygenated.